Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:574-576 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Water-soluble Factors in Melilotus Leaves Which Influence Feeding by the Sweetclover Weevil1

W. R. Akeson, F. A. Haskins, H. J. Gorz and G. R. Manglitz2

One factor which stimulates feeding and two factors which deter feeding by the adult sweetclover weevil have been separated by preparative paper chromatography of hot water extracts of Melilotus leaves. The factors were detected with a bioassay which measures feeding by adult weevils on sweetclover root disks impregnated with the extract or fraction being tested. A feeding stimulant (Stimulant A) and a feeding deterrent (Deterrent A) were found in both the resistant species, M. infesta, and a susceptible species, M. officinalis, in approximately equal amounts. A second feeding deterrent (Deterrent B) was found only in extracts from M. infesta. All available evidence suggests that Deterrent B is the factor primarily responsible for the resistance of M. infesta to the sweeetclover weevil.

Key Words: Sitona cylindricollis • sweetclover weevil • Melilotus infesta • Melilotus officinalis • paper chromatography • bioassay • feeding stimulant • feeding deterrent

1 A cooperative investigation between the Nebraska Agricultural Experiment Station, University of Nebraska, and the Entomology Research Division and Crops Research Division, Agr. Res. Serv., USDA, supported in part by ARS Grant No. 12-14-100-8027(33). Contribution No. 294 of Department of Entomology, University of Nebraska. Published with approval of the Director as Paper No. 2273. Journal Series, Neb. Agr. Exp. Sta.

2 Assistant Professor and Professor of Agronomy, Univ. of Nebraska; Research Geneticist, Crops Research Division, and Research Entomologist, Entomology Research Division, ARS, USDA, respectively, Lincoln, Neb. 68503. The technical assistance of Henry J. Stevens, Agr. Res. Tech., Entomology Research Division, ARS, USDA; and Gary L. Beland, Grad. Res. Asst., Dept. of Entomology, Univ. of Nebraska, is gratefully acknowledged.

Received for publication March 15, 1968.


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W. R. Akeson, F. A. Haskins, and H. J. Gorz
Sweetclover-Weevil Feeding Deterrent B: Isolation and Identification
Science, January 17, 1969; 163(3864): 293 - 294.
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